Fix MLMG tortuosity: pin boundary cells to match HYPRE convention#238
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jameslehoux merged 1 commit intoworkingfrom Apr 1, 2026
Merged
Fix MLMG tortuosity: pin boundary cells to match HYPRE convention#238jameslehoux merged 1 commit intoworkingfrom
jameslehoux merged 1 commit intoworkingfrom
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AMReX MLABecLaplacian applies Dirichlet BCs at domain faces (half-cell outside boundary cell centres), but the shared globalFluxes() code computes cell-to-cell gradients assuming HYPRE's convention where Dirichlet values are at boundary cell centres. This caused MLMG to report tau=1.0 instead of the correct (N-1)/N for uniform blocks. Fix: after the MLMG solve, overwrite boundary cells with vlo/vhi so the flux integration sees the same boundary conditions as HYPRE. Also fixes clang-format violations from the previous commit. https://claude.ai/code/session_01RKnn97qiD7sbCeABHH3eQk
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AMReX MLABecLaplacian applies Dirichlet BCs at domain faces (half-cell outside boundary cell centres), but the shared globalFluxes() code computes cell-to-cell gradients assuming HYPRE's convention where Dirichlet values are at boundary cell centres. This caused MLMG to report tau=1.0 instead of the correct (N-1)/N for uniform blocks.
Fix: after the MLMG solve, overwrite boundary cells with vlo/vhi so the flux integration sees the same boundary conditions as HYPRE.
Also fixes clang-format violations from the previous commit.